<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    a {
        text-decoration: none;
    }

    div {
        text-decoration: underline;
    }

    p {
        text-decoration: line-through;
    }

    span {
        text-decoration: overline;
    }
</style>

<body>
    <a href="#">a标签，去掉下划线</a>
    <div>div标签，添加下划线</div>
    <p>p标签添加删除线</p>
    <span>span标签，添加置顶划线</span>
</body>

</html>